nlp = spacy.en.English()
nlp.matcher.add('splash', 'my entity', {},[ [{LEMMA: 'splash'}, {LEMMA: 'on'}]])
nlp('splash On')

Traceback (most recent call last):
File "lib/python3.5/site-packages/spacy/language.py", line 328, in call
proc(doc)
File "spacy/syntax/parser.pyx", line 146, in spacy.syntax.parser.Parser.call (spacy/syntax/parser.cpp:6114)
spacy.syntax.parser.ParserStateError: Error analysing doc -- no valid actions available. This should never happen, so please report the error on the issue tracker. Here's the thread to do so --- reopen it if it's closed:
#429
Please include the text that the parser failed on, which is:
'splash On'